中国激光, 2019, 46 (12): 1207001, 网络出版: 2019-12-02   

高斯谢尔模型光束在生物组织中的光谱变化 下载: 948次

Changes in Spectra of Gaussian Schell-Model Beams Propagating in Biological Tissues
作者单位
1 中北大学理学院, 山西 太原 030051
2 吕梁学院物理系, 山西 吕梁 033001
摘要
以广义惠更斯-菲涅耳原理为基础,推导高斯谢尔模型光束在生物组织中的光谱解析表达式,并利用归一化光谱和相对光谱移动,研究高斯谢尔模型光束在生物组织中传输时的光谱变化。结果表明:高斯谢尔模型光束在生物组织中传输时会出现光谱蓝移、红移及跃变,且与离轴距离、传输距离、生物组织类型(不同的折射率结构常数)及空间相关长度有关;随着传输距离增大,折射率结构常数增大,即生物组织湍流越强,空间相关长度越大,光谱跃变位置越远,跃变量越小,即光谱跃变现象越弱,光谱红移转变为蓝移的传输位置越远;折射率结构常数和空间相关长度越大,光谱跃变对应的离轴距离越大,即跃变的观察点到传输轴的距离越大。
Abstract
In this study, an analytical expression is derived based on the extended Huygens-Fresnel principle for the spectrum of a Gaussian Schell-model (GSM) beam that propagates in biological tissues. The spectral change of the GSM beam during propagation is studied based on the normalized spectrum and the relative spectral shift. Results show that the spectral blue shift, red shift, and rapid transition can be observed when the GSM beam propagates in biological tissues, and they are dependent on the off-axis distance, propagation distance, type of biological tissue specimen (specifically the refractive-index structure constant of tissue turbulence), and spatial correlation length. As the propagation distance increases, the refractive-index structure constant increases, meaning that the turbulence of biological tissue becomes stronger. Meanwhile, as the spatial correlation length increases, the position where spectral rapid transition occurs is farther and the transition qualities correspondingly decrease; furthermore, the spectral rapid transition becomes increasingly weak and the propagation position where a transition can be observed from the spectral red shift to blue shift becomes increasingly distant. With increasing values of the refractive-index structure constant and the spatial correlation length, the off-axis distance associated with the spectral rapid transition will also increase, i.e., the distance between the observation position and the propagation axis will increase.

田燕男, 段美玲, 吴云光, 张永梅. 高斯谢尔模型光束在生物组织中的光谱变化[J]. 中国激光, 2019, 46(12): 1207001. Yannan Tian, Meiling Duan, Yunguang Wu, Yongmei Zhang. Changes in Spectra of Gaussian Schell-Model Beams Propagating in Biological Tissues[J]. Chinese Journal of Lasers, 2019, 46(12): 1207001.

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